"Jim Mueller" wrote in message b.com...
On Fri, 06 Sep 2013 09:57:57 -0700, Guv Bob wrote:
snip
Thanks Jim. I have no experience with 555 timers. Where would I find a
basic circuit for this application using a 555?
Here's a data sheet: http://www.ti.com/lit/ds/symlink/lm555.pdf. It has
a number of generic circuits. What you want is a monostable circuit. It
can be set up to trigger from power-on or from a separate signal. Can
you modify the example circuit yourself or do you need help?
--
Jim Mueller
To get my real email address, replace wrongname with dadoheadman.
Then replace nospam with fastmail. Lastly, replace com with us.
Thanks, Jim, that's a big help. I'm afraid I do need more help. Someone also mentioned needing a diode. I'm pretty lost at the component level.
If it helps, the application is to energize a small LED for approx 5 seconds when 12VDC is applied to the input. After 5 seconds the LED should go off even though 12VDC is still on the input.
I don't have the LED current draw, but it's very small - probably on the order of 10ma.
Many thanks for this help!
Bob